string.c: Fix typos in comment.
[paraslash.git] / ogg_afh.c
index debc0c9..93ad14b 100644 (file)
--- a/ogg_afh.c
+++ b/ogg_afh.c
@@ -1,8 +1,4 @@
-/*
- * Copyright (C) 2004-2014 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2004 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
 
 /** \file ogg_afh.c Audio format handler for ogg/vorbis files. */
 
@@ -20,6 +16,20 @@ struct private_vorbis_data {
        vorbis_comment vc;
 };
 
+/*
+ * Vorbis uses three header packets, all of which are required: the
+ * identification header, the comments header, and the setup header.
+ *
+ * The identification header identifies the bitstream as Vorbis. It contains
+ * the Vorbis version and simple audio characteristics of the stream such as
+ * sample rate and number of channels.
+ *
+ * The comment header includes user text comments (tags) and a vendor string
+ * for the application/library that produced the bitstream.
+ *
+ * The setup header includes extensive CODEC setup information as well as the
+ * complete VQ and Huffman codebooks needed for decoding.
+ */
 static int vorbis_packet_callback(ogg_packet *packet, int packet_num,
                __a_unused int serial, struct afh_info *afhi, void *private_data)
 {
@@ -52,45 +62,24 @@ static int ogg_vorbis_get_file_info(char *map, size_t numbytes, __a_unused int f
 {
        int ret;
        struct private_vorbis_data pvd;
-       struct ogg_afh_callback_info vorbis_callback_info = {
+       struct oac_callback_info vorbis_callback_info = {
                .packet_callback = vorbis_packet_callback,
                .private_data = &pvd,
        };
 
        vorbis_info_init(&pvd.vi);
        vorbis_comment_init(&pvd.vc);
-       ret = ogg_get_file_info(map, numbytes, afhi, &vorbis_callback_info);
+       ret = oac_get_file_info(map, numbytes, afhi, &vorbis_callback_info);
        vorbis_info_clear(&pvd.vi);
        vorbis_comment_clear(&pvd.vc);
        return ret;
 }
 
-struct vorbis_get_header_data {
-       ogg_stream_state os;
-       char *buf;
-       size_t len;
-};
-
-static void add_ogg_page(ogg_page *og, struct vorbis_get_header_data *vghd)
-{
-       size_t old_len = vghd->len;
-       size_t new_len = vghd->len + og->header_len + og->body_len;
-       char *buf = para_realloc(vghd->buf, new_len), *p = buf + old_len;
-
-       memcpy(p, og->header, og->header_len);
-       memcpy(p + og->header_len, og->body, og->body_len);
-       vghd->buf = buf;
-       vghd->len = new_len;
-       PARA_DEBUG_LOG("header/body/old/new: %lu/%lu/%zu/%zu\n",
-               og->header_len, og->body_len, old_len, new_len);
-}
-
 static int vorbis_get_header_callback(ogg_packet *packet, int packet_num,
                int serial, __a_unused struct afh_info *afhi, void *private_data)
 {
        int ret;
-       struct vorbis_get_header_data *vghd = private_data;
-       ogg_page og;
+       struct oac_custom_header *h = private_data;
        static unsigned char dummy_packet[] = {
                0x03,
                'v', 'o', 'r', 'b', 'i', 's',
@@ -101,17 +90,12 @@ static int vorbis_get_header_callback(ogg_packet *packet, int packet_num,
        };
 
        PARA_DEBUG_LOG("processing ogg packet #%d\n", packet_num);
-       if (packet_num > 2)
-               return 0;
        if (packet_num == 0) {
-               ogg_stream_init(&vghd->os, serial);
-               ret = ogg_stream_packetin(&vghd->os, packet);
+               oac_custom_header_init(serial, h);
+               ret = oac_custom_header_append(packet, h);
                if (ret < 0)
-                       goto out;
-               ret = -E_OGG_STREAM_FLUSH;
-               if (ogg_stream_flush(&vghd->os, &og) == 0)
-                       goto out;
-               add_ogg_page(&og, vghd);
+                       return ret;
+               oac_custom_header_flush(h);
                return 1;
        }
        if (packet_num == 1) {
@@ -119,54 +103,84 @@ static int vorbis_get_header_callback(ogg_packet *packet, int packet_num,
                PARA_INFO_LOG("replacing metadata packet\n");
                replacement.packet = dummy_packet;
                replacement.bytes = sizeof(dummy_packet);
-               ret = ogg_stream_packetin(&vghd->os, &replacement);
-               if (ret >= 0)
-                       return 1;
-               ret = -E_OGG_PACKET_IN;
-               goto out;
+               ret = oac_custom_header_append(&replacement, h);
+               return ret < 0? ret : 1;
        }
-       ret = -E_OGG_PACKET_IN;
-       if (ogg_stream_packetin(&vghd->os, packet) < 0)
-               goto out;
-       while (ogg_stream_flush(&vghd->os, &og))
-               add_ogg_page(&og, vghd);
-       ret = 0;
-out:
-       ogg_stream_clear(&vghd->os);
-       return ret;
+       assert(packet_num == 2);
+       ret = oac_custom_header_append(packet, h);
+       if (ret < 0)
+               return ret;
+       oac_custom_header_flush(h);
+       return 0;
 }
 
 static void vorbis_get_header(void *map, size_t mapsize, char **buf,
                size_t *len)
 {
        int ret;
-       struct vorbis_get_header_data vghd = {.len = 0};
-       struct ogg_afh_callback_info cb = {
+       struct oac_custom_header *h = oac_custom_header_new();
+       struct oac_callback_info cb = {
                .packet_callback = vorbis_get_header_callback,
-               .private_data = &vghd,
+               .private_data = h,
        };
 
-       ret = ogg_get_file_info(map, mapsize, NULL, &cb);
+       ret = oac_get_file_info(map, mapsize, NULL, &cb);
+       *len = oac_custom_header_get(buf, h);
+       if (ret < 0) {
+               PARA_ERROR_LOG("could not create ogg/vorbis header: %s\n",
+                       para_strerror(-ret));
+               free(*buf);
+               *buf = NULL;
+               *len = 0;
+       } else
+               PARA_INFO_LOG("created %zu byte ogg vorbis header\n", *len);
+}
+
+static int vorbis_make_meta_packet(struct taginfo *tags, ogg_packet *result)
+{
+       vorbis_comment vc;
+       int ret;
+
+       vorbis_comment_init(&vc);
+       vorbis_comment_add_tag(&vc, "artist", tags->artist);
+       vorbis_comment_add_tag(&vc, "title", tags->title);
+       vorbis_comment_add_tag(&vc, "album", tags->album);
+       vorbis_comment_add_tag(&vc, "year", tags->year);
+       vorbis_comment_add_tag(&vc, "comment", tags->comment);
+       ret = vorbis_commentheader_out(&vc, result);
+       vorbis_comment_clear(&vc);
+       if (ret != 0)
+               return -E_VORBIS_COMMENTHEADER;
+       return 1;
+}
+
+static int vorbis_rewrite_tags(const char *map, size_t mapsize,
+               struct taginfo *tags, int output_fd,
+               __a_unused const char *filename)
+{
+       int ret;
+       ogg_packet packet;
+
+       ret = vorbis_make_meta_packet(tags, &packet);
        if (ret < 0)
-               goto fail;
-       *buf = vghd.buf;
-       *len = vghd.len;
-       PARA_INFO_LOG("created %zu byte ogg vorbis header\n", *len);
-       return;
-fail:
-       PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+               return ret;
+       ret = oac_rewrite_tags(map, mapsize, output_fd, (char *)packet.packet,
+               packet.bytes);
+       free(packet.packet);
+       return ret;
 }
 
-static const char* ogg_suffixes[] = {"ogg", NULL};
+static const char * const ogg_suffixes[] = {"ogg", NULL};
 
 /**
  * The init function of the ogg vorbis audio format handler.
  *
  * \param afh Pointer to the struct to initialize.
  */
-void ogg_init(struct audio_format_handler *afh)
+void ogg_afh_init(struct audio_format_handler *afh)
 {
        afh->get_file_info = ogg_vorbis_get_file_info;
        afh->get_header = vorbis_get_header;
        afh->suffixes = ogg_suffixes;
+       afh->rewrite_tags = vorbis_rewrite_tags;
 }